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Keywords: planetary nebula, supernova remnant
![IC 4406: квадратная туманность](https://images.astronet.ru/pubd/2006/10/26/0001217147/ic4406_hst.preview.jpg)
27.04.1998
How can a round star make a square nebula? This conundrum came to light with the discovery of planetary nebulae like IC 4406. IC 4406 is most probably cylindrical, with its square appearance the result of our vantage point in viewing the cylinder.
![IC 4406: "квадратная" туманность](https://images.astronet.ru/pubd/2002/06/18/0001177404/ic4406_hst.preview.jpg)
18.06.2002
How can a round star make a square nebula? This conundrum comes to light when studying planetary nebulae like IC 4406. Evidence indicates that IC 4406 is likely a hollow cylinder, with its square appearance the result of our vantage point in viewing the cylinder from the side.
![Планетарная туманность NGC 2440](https://images.astronet.ru/pubd/2007/02/15/0001220793/ngc2440_hst_c720.preview.jpg)
15.02.2007
Planetary nebula NGC 2440 has an intriguing bow-tie shape in this stunning view from space. The nebula is composed of material cast off by a dying sun-like star as it enters its white dwarf phase of evolution.
![M2-9: Крылья Туманности Бабочка](https://images.astronet.ru/pubd/2004/10/06/0001199811/m2-9_hst.preview.jpg)
6.01.2002
Are stars better appreciated for their art after they die? Actually, stars usually create their most artistic displays as they die. In the case of low-mass stars like our Sun and M2-9 pictured above, the stars transform themselves from normal stars to white dwarfs by casting off their outer gaseous envelopes.
![NGC 6210: Черепаха в планетарной туманности](https://images.astronet.ru/pubd/2004/08/12/0001199101/ngc6210_hst_big.preview.jpg)
28.10.1998
A Turtle in Space? Planetary nebula NGC 6210 may look like a giant space turtle, but it is actually much more massive and violent. Fortunately, this gas cloud in Hercules lies about 6500 light years away.
![M2 9: крылья туманности Бабочка](https://images.astronet.ru/pubd/2004/02/01/0001196423/m2-9_hst.preview.jpg)
1.02.2004
Are stars better appreciated for their art after they die? Actually, stars usually create their most artistic displays as they die. In the case of low-mass stars like our Sun and M2-9 pictured above, the stars transform themselves from normal stars to white dwarfs by casting off their outer gaseous envelopes.
![Гало вокруг туманности Гантель](https://images.astronet.ru/pubd/2003/07/25/0001191751/m27ha_gendler_c1.preview.jpg)
25.07.2003
In 1764, French astronomer Charles Messier sighted this gorgeous cosmic cloud which he described as an oval nebula without stars. Cataloged as M27, it is now popularly known as the Dumbbell Nebula...
![M27: это не комета](https://images.astronet.ru/pubd/2004/04/24/0001197795/m27_vlt_f1_sm.preview.jpg)
24.04.2004
While searching the skies above 18th century France for comets, astronomer Charles Messier diligently recorded this object as number 27 on his list of things which are definitely not comets. So what is it?
![Наблюдения туманности Улитка на телескопах Бланко и Хаббл](https://images.astronet.ru/pubd/2004/12/30/0001201626/helix_hst.preview.jpg)
29.12.2004
How did a star create the Helix nebula? The shapes of planetary nebula like the Helix are important because they likely hold clues to how stars like the Sun end their lives. Recent observations...
![Планетарная туманность Красный Паук](https://images.astronet.ru/pubd/2002/08/25/0001179300/ngc6537_hst.preview.jpg)
24.07.2001
Oh what a tangled web a planetary nebula can weave. The Red Spider Planetary Nebula shows the complex structure that can result when a normal star ejects its outer gases and becomes a white dwarf star.
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